document.addEventListener("mouseup",handleStart,false);
function handleStart(evt){
    var spot = document.createElement('div');
    spot.className="mouseheart";
    spot.style.top=evt.screenY - 70 +"px";
    spot.style.left=evt.screenX - 10 +"px";
    document.body.appendChild(spot);
    setTimeout(function(){spot.style.display="none";},1000);
}